Texas Instruments INA199C2QDCKRQ1

Overview

INA199C2QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier with bidirectional capability, zero-drift architecture, and fixed 100 V/V gain. It operates from 2.7 V to 26 V supply, supports common-mode input range from –0.1 V to 26 V, delivers ±150 μV max offset voltage, and achieves ±1% max gain error over –40°C to +125°C - enabling precise low-side or high-side shunt monitoring in brake systems and body control modules.

For engineers reviewing the INA199C2QDCKRQ1 datasheet, INA199C2QDCKRQ1 pinout, INA199C2QDCKRQ1 application, or INA199C2QDCKRQ1 equivalent, key selection criteria include its 100 V/V fixed gain, SC70-6 package footprint, 0.5 μV/°C max offset drift, 10 ppm/°C max gain drift, and functional safety documentation support for ISO 26262-compliant designs.

Technical Context

The INA199C2QDCKRQ1 implements a zero-drift chopper-stabilized topology to maintain ultra-low offset (±150 μV) and minimal drift (0.5 μV/°C) across automotive temperature extremes. Its differential input stage rejects common-mode voltages up to 26 V independent of supply voltage, supporting both high-side and low-side configurations without external level-shifting circuitry.

It features a precision resistor network (R3 = R4 = 10 kΩ) internally configured for 100 V/V gain, delivering 80 dB minimum CMRR and 30 kHz bandwidth at that gain setting. The REF pin allows output offset adjustment, enabling unidirectional or bidirectional current sensing with rail-to-rail compatible output swing (GND + 5 mV to V+ – 200 mV).

Key Specifications

Pinout & Package

Package: 6-pin SC70 (2.00 mm × 1.25 mm), surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-sense amplifier applications.

Compared with INA199C2QDCKRQ1, INA240A2QDRQ1 trades common-mode range for speed and precision, while MAX40056ATA+T sacrifices automotive qualification for broader voltage handling - making INA199C2QDCKRQ1 the optimal balance of AEC-Q100 compliance, 26-V operation, and SC70 size for mainstream automotive body electronics.

Availability

INA199C2QDCKRQ1 is available at Aetrix Electronics and suitable for brake systems, body control modules, electric windows, and seat heaters requiring stable component supply throughout automotive production lifecycles.

Supply support for INA199C2QDCKRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with leadership in automotive, industrial, and power management ICs.

The INA199-Q1 product line was designed specifically for AEC-Q100-compliant current sensing in automotive body electronics, offering zero-drift precision, wide common-mode tolerance, and functional safety documentation to accelerate ASIL-B system integration.

FAQ

What is the maximum common-mode voltage supported by the INA199C2QDCKRQ1?

The INA199C2QDCKRQ1 supports a common-mode input voltage range of –0.1 V to 26 V, enabling direct connection to 12-V and 24-V automotive battery rails without external level-shifting components. This specification is guaranteed over the full –40°C to +125°C operating temperature range and is independent of the 2.7-V to 26-V supply voltage applied to the V+ pin. Exceeding 26 V continuously may cause permanent damage per absolute maximum ratings.

Does the INA199C2QDCKRQ1 support bidirectional current sensing?

Yes, the INA199C2QDCKRQ1 supports bidirectional current sensing through its REF pin, which accepts an externally applied reference voltage (0 V to V+). When REF is set to mid-supply (e.g., V+/2), the output voltage centers at that level - positive current produces OUT > REF, negative current produces OUT < REF. This configuration is used in electric window motor control and seat heater regulation where direction and magnitude both matter.

What is the gain accuracy of the INA199C2QDCKRQ1 over temperature?

The INA199C2QDCKRQ1 has a maximum gain error of ±1% over the full operating temperature range of –40°C to +125°C. This value is specified for the 'C' grade version (denoted by 'C2' in the part number) and includes contributions from initial tolerance, temperature drift (10 ppm/°C max), and linearity. It ensures consistent current-to-voltage conversion without recalibration across automotive thermal cycles.

Can the INA199C2QDCKRQ1 be used in high-side sensing configurations?

Yes, the INA199C2QDCKRQ1 is explicitly designed for both high-side and low-side current sensing. Its wide –0.1 V to 26 V common-mode input range allows IN+ and IN– to be referenced to voltages far above the device's supply rail - for example, connecting IN+ to a 24-V battery line while powering the device from a local 3.3-V LDO. No external level shifters or charge pumps are required.

What package type and dimensions does the INA199C2QDCKRQ1 use?

The INA199C2QDCKRQ1 uses a 6-pin SC70 package with nominal body dimensions of 2.00 mm × 1.25 mm and a maximum height of 0.9 mm. This compact surface-mount package is lead-free, RoHS-compliant, and optimized for automated assembly in space-constrained automotive modules such as mirror ECUs and door control units.